Sphygmomanometer.



M. HERZ. SPHYGMOMANOMBTBB.

Arrmouron rmm Nov. 2L 190s.

UNITED sTATEs PATENT oEEIcE.A

MAX HEEz, or VIENNA, AUsTEIA-HIntentar.l

SPHYGMOMANOMETEE.

l'o all whom it 'may concern:

le it known that I, MAX HERZ, a subject ot' the Emperor ofAustria-Hungary, and resident of Vienna, Austria-Hungary, have inventeda new and useful Improvement in `Sphygmomanonleters, ot' which thefollowling is a specification.

' manently closed at its outer end.'

ynometer, partly in section, s

A further object is to provide certain improvements in the form,construction and arrangement ot the various parts of thespl1ygmo-1nano1neter Wliich make it more convenient and accurate in use.y

A practical embodimentot my invention is shown lin the Iaccompanyingdrawings lin which,

Figure 1 is a view of my sphygmo-malowing the globule of mercury in anon-operative position, Fig. 2 is a section taken in the plane of theline A-A of Fig. 1, looking in the direction of the arrows, Fig. 3 is aview, partly in section, the full lines showing the device in positionfor 'permitting the mercury globule to take its operative position, andthe dotted lines ,showing how the manometer is commonly held When inuse, the air bag being secured about the wrist of the patient .and themercury globule being in its operative position, and Fig. 4 is a view,partly in section, of a modified 'form of manometer.

The manometer comprises an enlarged outer portion l, a bulb 2 and anelongated transparent intermediate portion 3. The outer portionV isclosed except as it communicates with the intermediate portion. The holethrough the intermediate portion 3 flares slightl as at 4, Where thatportion joins the bu b 2. The bulb 2 is provided with a. nipple 5extending Within and Without the same, the part within the bulb beingbent back upon itself, as at 6, to prevent the escape of the globule ofmercury 7 from the said bulb.

The intermediate portion 3 of the manometer may be graduatedvin anydesired manner, for instance, as shown in Figs. l, 3 and .4, the zeromark being located at the oint in the flare 4, which the mercury globu eoccu- Specication of Letters latent. Application lei November 27, 1908.Serial No. 464,524.

lual setting.

pies when dropped thereinto, as hereinafter described.

The air ba 8 is composed of any suitable material, an is referablyoblong in shape, and is connecte to the outer extension of the nipple 5by means of a iexible tube 9.

In the preferred form, shown in Figs. l and 3, the intermediate portionof the manometer is straight. In the modiiied form, shown in Fig. 4, theintermediate portion ot' the manometer 1s spiral in shape.

In operation, the manometer is inverted, as shown in Fig. 3, thuscausing the mercury globule to take its operative position in the liare4, a'nd close the intermediate portion, thus imprisoning the air in theintermediate and outer portions. The manometer may then be held in anydesired position, as the mercury globule will remain 1n its operative isWrapped snugly about the same and' pressed against the artery until thepulse disappears; the blood pressure in the artery will compress the airbag and thus'forcc air through the tube 9 and nipple 5 into' the bulb 2ot' the manometer. This air pressure will drive the mercury globule intothe intermediate portion of the manometer, compressing 4the air therein.The pressure of the patients blood may be determined by the scale on themanometer, using the nieri cury globule as an indicator. i

Thus it will be seen that I obtain a sphygmo-manometer which is smalland easy to carry; in which no water is used, and in which the cap orpetcock commonly used on the outer end of the manometer is done awaywith. This last point is a great improvement inasmuch as it has beenvery diilicult in practice to keep the cap or petcock tight.Furthermore, the indicator in my device automatically takes its ositionat the zero mark when in use and oes not require man- It is to beunderstoood that I do not wish to limit myself strictly to .the form andarrangement herein-set forth, as various alterations may be made Withoutdeparting from the spirit and scope of my invention.

What I claim 1s:

l. In a device of the character described, a manometer having a globuleof mercury in its inner end, and an internal flared portion Patented Jan. 4, 1910.

near its inner end for seating the globule bulb at its inner end, aglobule of mercury located normally in said bulb, andan inter-- nalflared portion near its inner end;` Jfor seating the globule When themanometer is inverted into position preparatory for use.

3. In a device ofthe character described, a manometer comprising a tubehaving a closed outer end and a bulb at its inner end, and a globule ofmercury located normally in said bulb, a flare being formed at thejunction of the tube and the bulb for seating the globule of mercuryWhen the manometer is inverted into position preparatory for use.

4. In a device of the character described, a'manometer having a closedouter end and a bulb at its innerend, a globule of mercurylocatednormally in said'bulb, a hollow nipple having an inner extension withinVsaid bulb for preventing the escape of the globule of mercury, and anair bag connected to said nipple.

5. In a device of the character described, a manometer having a closedouter end and' a bulb at its inner end, a globule of mercury locatednormally in said bulb, a hollow nip; ple having an inner extension bentback upon itself within said bulb for preventing the escape of theglobule of mercury, and an air bag connected to said-nipple.

, In a device of the character described, amanometer having a closedlouter end and a bulb 4at its inner end, a globule of mercury locatednormally in said bulb, a hollow nipple having an inner extension Withinthe bulbfor preventing the escape of the globule vof mercury and anouter extension exterior to sald bulb, and an air bag having a iiexibletube attached to said outer extension of the v nipple.

7; In a device of the character described, a manometer having a closedouter-.end Aand a bulb at its inner end, a globule of mercury locatednormally in said bulb, a hollow nipple `having an inner extension withinthe bulb for preventing the escape of the globule of mercury and anouter extension exterior to said bulb, and an air bag having a flexibletube removably attached tosaid outer extension of the nipple.

8. In a device of the character described,

a manometer. comprising an enlarged outer' closed end, a bulb and aninterposed-tube, anv airbag in open communication with said bulb, and aglobule of mercury located normally in said bulb and arranged to closethe inner end of said tube when the manometer is inverted into positionpreparatory for use.

9. In a device of the character described, a manometer having a closedouter end and a bulb at its inner end, an air bag in opencommunication,Witlnsaid bulb, a globule of mercury located normally insaid bulb, said manometer having'a graduated scale thereon, and saidglobule of mercury being a.r-. ranged to drop to the zelro mark of saidscale when the manometer is inverted into position preparatory for use.

In testimony, that I claim the foregoing as my invention, I have signedmy name in presence of two witnesses, this tenth day of November, 1908.

MAX vHERZ. Witnesses: ROBERT W. HEINcA-n'rNnu,

AUGUST Focene.

